Cylinder-cock



' (NoModel.)

J. F. MOCOY.

` GYLINDBR 000K. I ANo. 572,211. Patented Dec. 1, 1896.

Vof the same ou the line a; Fig. 1.

UNITED STATES PATENT OFFICE;

JAMES F. MCGOY, OF VINONA, MINNESOTA.

CYLINDER-COCK.

SPECIFICATION forming part of Letters Patent No. 572,211, slated Describir 1, 1896.

Application filed .April 9, 1896.

To @ZZ wwnL-zz nifty concern.'

Be it known that I, J AMES F. MCCOY, a citizen of the United States, residing at lVinona, in the county of Winona and State of Minnesota,have invented certain new and useful Improvements in Cylinder-Cocks; and I do declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specication.

My invention relates to what are known as cylinder-cocks for carrying away the waste steam and water of condensation from the cylinders of steam-engines, thereby preventing the blowing out or other injury to the cylinder-heads by the accumulation of Water in the cylinder caused by the condensation of steam therein.

The object of the invention is to provide an improved construction of such cock Whereby the same will be automatically closed by the current or momentum of the live steam admitted to the cylinder to drive the piston forward and will open during the exhaust or return stroke of the piston.

The invention consists in the novel construction and combination of parts hereinafter fully described and claimed.

In the accompanying drawings, Figure 1 is a central longitudinal section of a relief or cylinder cock constructed in accordance with my invention. Fig. 2 is a horizontal section In the said drawings the reference-numeral l designates a cylindrical casing screw-threaded interiorly at its upper end to receive a correspondingly-threaded plug 2, formed with an outletpassage 3, with which is connected an outlet-pipe 4. The inner end of this plug is formed with an annular recess 5, concentric with the passage 3, and its side is beveled, as seen at 6, and forms a valve-seat. Near the lower end of the casing and opposite to pipe 4 is an inlet-pipe 7, which is connected with the end of a steam-cylinder. (Not shown.) Located in said casing is a disk 8, which iits loosely therein, having securely fixed at its center a vertical stem or rod 9,

the upper end of which is screw-threaded and Serial No. 586,854. (No model.)

y engages with a correspondingly-threaded aperture in the upper end of an inverted-cupshaped vertically-movable valve 10. This valve consists of a cylindrical portion 13, closed at its upper end and beveled to correspond with the seat in the plug and formed near said end with a number of holes or openings 14 and provided at its lower end with a perpendicular iiange l5, which iits in the cas ing. The areas of this valve and the disk are equal, so that they will balance each other.

The operation is as follows: In practice two of these cocks are employed, one at each end of the cylinder, which alternately open and close, as is understood by those familiar with the art to which the invention pertains. In Fig. 1 the parts are shown in the position they occupy when the cylinder is exhausting. The waste steam and waters ofcondensation escape from the cylinder into the casing and from thence through the openings in the valve to the outlet passage and pipe, the current not having sufcient power to raise the valve. On the return stroke of the piston the live steam vadmitted to the cylinder will rush violently through t-he inlet-pipe 7 into the casing, and the current, striking the upper end of the valve, will, by its momentum or impetus, raise it to its seat and close the outlet-passage. The steam will also'escape between the edge of the disk and the casing to the space underneath the disk and by its pressure will retain the valve in its closed position. Upon the cylinder again exhausting the pressure will be reduced, when the disk and valve will fall by gravity, opening the outlet-passage and again allowing the waters of condensation to escape. This operation will take place alternately at each end of the cylinder. It will thus be seen that the valve is closed by the current or :momentu 1n of the live steam and retained in such closed position by the pressure thereof, and opens by gravity when the pressure is relieved when the exhaust takes place. In some engines the back pressure may possibly be so great that the current of the steam would have sufficient power to close the valve during the exhaust and thus render it inoperative. To obviate this in such engines the disk is enlarged, so that its area will be greater than that of the valve, so as to overbalance the same and thus counteract IOO the effects of such back pressure, yet still allowing the current of livc steam to raise and close the valve.

IfIaving thus fully described my invention, what I claim isl. In a cylinder-cock, the combination with a casing having an inlet near one end, and an outlet-passage at the opposite end, of a vertically-movable hollow valve, the upper end or dome of which is closed and adapted to close the outlet-passage and the walls of which are provided with openings, a disk arranged Within said casing below the inlet and of less diameter than the interior diameter of the casing to form a space therebetween, and a stem for connecting the disk to the valve, substantially as set forth.

In a cylinder-cock, the combination with the cylindrical casing having an inlet-pipe near its lower end, the screw-plug at the upper end having an outlet-passage, and provided with a valve-seat in its inner end, oil the inverted vertically1novable cup-shaped valve, located in said casing, closed at its upper end and beveled to correspond with the valve-seat, and formed with openings near its upper end, and with an annular flange at its lower end, the stein or rod and the disk connected with said valve, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES F. MCCOY.

lVitnesses: l

W. A. FINKELNBURG, J oHN Rosn. 

